Recurring natural water cooling device

ABSTRACT

A recurring natural water cooling device is provided. The recurring natural water cooling device includes a flow channel through which a natural water flow from a natural water source is circulated, a thermal exchanging device through which a thermal fluid flows and being placed in the flow channel so as to transfer a heat of the thermal fluid to the natural water flow, a power device speeding up the circulated natural water, and a plurality of diversion devices communicatively connecting the natural water source and the flow channel.

FIELD OF THE INVENTION

The present invention relates to a cooling device. More particularly,the present invention relates to a recurring cooling device making useof natural water.

BACKGROUND OF THE INVENTION

With development of the current industry, thermal exchangers have beenwidely employed in the oil-refining industry, petrifaction industry,hi-tech electronic industry and the like, as the devices for heatremoving.

Since the thermal exchanger is generally used in miscellaneousenvironments where the conditions of capacity, pressure, temperature andthe like are different from one another, the thermal exchanger has to beformed in various shapes, structures and categorizations. The shell-tubethermal exchanger can be one of the most widely used thermal exchangers.Such shell-tube thermal exchanger can be seen from FIG. 1. As shown, acool liquid serves as a coolant 14 and flows into an enclosed troughbody 11 having the thermal exchanger formed therein, the thermalexchanger being formed by winding a lot of slender metal tubes 12 andthe thermal exchanger being surrounded by the coolant. The enclosedtrough body 11 is termed as “casing”, while the metal tube is termed as“tube body”.

The shell-tube thermal exchanger is operated according to the processdescribed below. At first, a thermal fluid 16 to be cooled is pouredinto the thermal exchanger composed of the metal tubes 12. Then, theheat of the thermal fluid 16 is transferred to the coolant 14 whosetemperature is relatively lower than that of the thermal fluid 16. Assuch, a thermal exchange occurs between the thermal fluid 16 and thecoolant 14. In the course of thermal exchanging, the thermal fluid 16 islowered in temperature and becomes another thermal fluid 17, while thecoolant 14 is elevated in temperature and becomes another coolant 15. Assuch, the cooling function is achieved.

The metal tubes 12 are typically extended and fixed by welding to a tubeplate 13 to form a tube group. Next, the tube group is inserted into thecasing 11 to from the thermal exchanger. In the thermal exchanger, themetal tubes 12 are disposed horizontally in general. However, the metaltubes 12 may also be disposed vertically in the case that the areaoccupied by the metal tube is limited or the thermal exchanger is usedfor the purpose of distillation.

The thermal exchanger may be categorized into several types according tothe connection between the tube plate and the casing, such as a fixedtube plate based thermal exchanger, a floated head based thermalexchanger and a U-shape tube based thermal exchanger. However, no matterwhich type of the thermal exchanger is used, there exist the followingissues. Firstly, Since the casing is sealed up and thus depositedarticles therein are hard to be removed, a highly polluted or erosivefluid is not suitable to serve as the coolant. Secondly, there is atemperature difference between the two fluids, at the casing side andthe metal tube side, which is greater than 100° C. In addition, anexcessively large difference of thermal expansion coefficient ispresented between the material of the casing and that of the metal tube.Accordingly, a significant expansion difference occurs between thecasing and the metal tube and causes a non-uniform expansion in thethermal exchanger, leading to failure of the thermal exchanger. This isalso true for the case where the temperature is low owing to thesignificant difference of thermal expansion coefficient. Thirdly, forthe thermal exchanger, the more complicate the structure thereof is, thehigher the cost therefor will be. Fourthly, the larger the pressure inthe thermal exchanger is or the higher the requirement of the thermalexchange is, the thicker the metal tube will be and the larger thevolume of the thermal exchanger will be, leading to a larger occupationarea of the thermal exchanger. Fifthly, the thermal exchanger generateswaste heat in operation into the ambient environment, adverselyincreasing the greenhouse effect and polluting the environment. Sixthly,the thermal exchanger generates unpleasant noises in operation.Seventhly, fluorine and chlorine carbides generally serve as thecoolant, forming a menace to the ozone layer surrounding the earth.Eighthly, a huge amount of power energy is consumed during thetemperature reduction process, causing a power waste for the heatexchanger.

Take the air-conditioning apparatus for example, the waste heat ventedtherefrom will be dispersed in the air, which causes a power thermalsaturation of the air nearby not long after the operation of theair-conditioning apparatus, and thus the waste heat is accumulated andneeds a long time to be removed. Consequently, the air temperature iselevated and the operating efficiency of the heat exchanger is lowered.

From the above description, it is known that how to develop a recurringnatural water cooling device has become a major problem to be solved. Inorder to overcome the drawbacks in the prior art, a recurring naturalwater cooling device is provided. The particular design in the presentinvention not only solves the problems described above, but also is easyto be implemented. Thus, the invention has the utility for the industry.

SUMMARY OF THE INVENTION

In accordance with an aspect of the present invention, a recurringnatural water cooling device is provided. The recurring natural watercooling device comprises a flow channel through which a natural waterflow from a natural water source is circulated, a thermal exchangingdevice through which a thermal fluid flows and being placed in the flowchannel so as to transfer a heat of the thermal fluid to the naturalwater flow, a power device speeding up the circulated natural waterflow, and a plurality of diversion devices communicatively connectingthe natural water source and the flow channel.

In an embodiment, the circulated natural water flow flows back to thenatural water source.

In an embodiment, the natural water source is one of a surface watersource and a groundwater source.

In an embodiment, each of the plurality of diversion devices is one of adiversion device formed artificially and a diversion device formednaturally.

In an embodiment, the power device is placed in the flow channel.

In an embodiment, the power device is placed in the plurality ofdiversion devices.

In an embodiment, the flow channel is one of a flow channel formedartificially and a flow channel formed naturally.

In an embodiment, the power device is a pump.

In an embodiment, the thermal exchanging device comprises a heattransferring device through which the thermal fluid flows and surroundedby a coolant so as to transfer the heat of the thermal fluid to thecoolant, wherein the coolant is the natural water flow.

In an embodiment, the heat transferring device is a wound metal tube.

In accordance with another aspect of the present invention, a recurringnatural water cooling device is provided. The recurring natural watercooling device comprises a flow channel through which a natural waterflow from a natural water source is circulated, a thermal transferringdevice through which a thermal fluid flows and being placed in the flowchannel so as to transfer a heat of the thermal fluid to the naturalwater flow, and a plurality of diversion devices communicativelyconnected between the natural water source and the flow channel.

In an embodiment, the circulated natural water flows back to the naturalwater source.

In an embodiment, the natural water source is one of a surface watersource and a groundwater source.

In an embodiment, each of the plurality of diversion devices is one of adiversion device formed artificially and a diversion device formednaturally.

In an embodiment, the thermal exchanging device comprises a heattransferring device through which the thermal fluid flows, andsurrounded by a coolant so as to transfer the heat of the thermal fluidto the coolant, wherein the coolant is the natural water flow.

In an embodiment, the heat transferring device is a wound metal tube.

In accordance with yet another embodiment, a cooling system isdisclosed, which comprises a natural water source providing a naturalwater flow, a thermal exchanging device transferring a heat from athermal fluid to the natural water, and a connecting device connectedbetween the natural water source and the heat transferring device.

In an embodiment, the natural water flow flows back to the natural watersource after having received the heat from the thermal fluid.

In an embodiment, the natural water source is one of a surface watersource and a groundwater source.

Other objects, advantages and efficacy of the present invention will bedescribed in detail below taken from the preferred embodiments withreference to the accompanying drawings, in which:

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic diagram of a conventional shell-tube heatexchanger;

FIG. 2 is a schematic diagram illustrating the operating process of arecurring natural water cooling device according to a first embodimentof the present invention; and

FIG. 3 is a schematic diagram illustrating the operating process of therecurring natural water cooling device according to a second embodimentof the present invention; and

FIG. 4 is a schematic diagram of a heat transferring device in therecurring natural water cooling device according to the presentinvention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

The present invention will now be described more specifically withreference to the following embodiments. It is to be noted that thefollowing descriptions of preferred embodiments of this invention arepresented herein for purposes of illustration and description only; itis not intended to be exhaustive or to be limited to the precise formdisclosed.

In this invention, a natural water is used and the groundwater is takenas an example of the natural water for illustration. The ground watercan be maintained around twenty degrees on average for long and is thusan excellent coolant. In general, the groundwater source may be selectedfrom the confined aquifer zone, non-confined aquifer zone, perchinggroundwater zone, interflow groundwater zone, etc. Among them, thegroundwater obtained from the confined aquifer zone is used forillustration herein. Certainly, the groundwater from the othergroundwater sources can also be used. This embodiment is provided merelyfor illustration and should not be considered in a limiting sense.Referring to FIG. 2, a schematic diagram for illustrating how therecurring natural water cooling device operates according to a firstembodiment of the present invention is depicted therein. As shown in.FIG. 2, a first thermal fluid 28 flows from the air-conditioning tool 27and a second thermal fluid 29 is obtained after the first thermal fluid28 is processed in the thermal exchanging device. In this embodiment,the recurring natural water cooling device comprises a first diversiondevice 21, a flow channel 22, a power device 23, a thermal transferringdevice 24, a second diversion device 25, a third diversion device 26 andan air-conditioning tool 27. The air-conditioning tool 27 drains out afirst thermal fluid 28. After being processed by the thermal exchangingdevice 24, the first thermal fluid 28 is converted into a second thermalfluid 29. A first groundwater flow 210 serves as a coolant for thethermal exchanging deice 24. A second groundwater flow 211 is used toreceive the heat of the first thermal fluid 28. In this embodiment, aconfined aquifer zone 212 is used as the natural water source. Thefirst, second and third diversion devices 21, 25, 26 form a plurality ofdiversion devices for the recurring natural water device.

In forming the recurring natural water cooling device, the firstdiversion device 21 is first formed. In this embodiment, the firstdiversion device 21 is a well, a tube for water guiding, or any devicewhich can achieve the purpose of water guiding. The first diversiondevice 21 has to be connected to the confined aquifer zone 212 so thatthe flow channel 22 is connected with the confined aquifer zone 212 andthe first groundwater flow 210 can be provided to the flow channel 22.However, the first diversion device 21 may be implemented in many formsother than the above-mentioned one.

Then, the flow channel 22 is formed, in which a room sufficient fordisposition of the heat transferring device 24 and the power device 23and for the first groundwater flow 210 to flow therein has to beprovided. The flow channel 22 may be a deep well, a shallow well, acasing pipe and any other devices which can achieve the same purpose.Further, the flow channel 22 may be one formed artificially ornaturally. In addition, the flow channel 22 may be formed above theground, as contrast to the above embodiment where the flow channel 22 isformed under the ground. However, the flow channel 22 may be implementedin many forms other than the above-mentioned one.

Subsequently, the second and third diversion devices 25, 26 are formed.The second diversion device 25 is a tube for water guiding and used toconnect the power device 23 with the third diversion device 26. Thesecond diversion device 25 may be a metal tube, a concrete tube or anyother devices which can be used for water guiding, as long as the samepurpose can be achieved. In addition, the second diversion device 25 maybe one formed artificially or naturally.

The third diversion device 26 is a recharge well of the groundwater,which can be one formed artificially or naturally according to actualneeds. The third diversion device 26 is connected to the seconddiversion device 25 and the confined aquifer zone 212 so as to directthe second groundwater flow 211 to flow back to the confined aquiferzone 212. In this manner, the purpose of environment protection may beachieved since the groundwater obtained from the underground can flowback to the underground after being utilized for the cooling task.

In the recurring natural water cooling device, the thermal exchangingdevice 24 and the power device 23 are placed in the flow channel 22. Inthis embodiment, the power device 23 is a pump. The power device 23accelerates the first groundwater flow 210 in the flow channel 22 toflow through and surround the thermal exchanging device 24. Then, thefirst groundwater flow 210 is guided to the power device 23 and then thesecond diversion device 25. Each of the second and third diversiondevices 25, 26 can be presented in any form and located under or abovethe ground. The second and third diversion devices 25, 26 can beimplemented in a manner other than those described above, as long as theabove-mentioned function can be achieved.

In operation, the first thermal fluid 28 drained from theair-conditioning tool 27 is a waste heat containing fluid in any form,which is then directed to the thermal exchanging device 24. The coolantfor the thermal exchanging device 24 is the first groundwater flow 210.Since the first groundwater flow 210 has a temperature lower than thatof the first thermal fluid 28, the heat of the first thermal fluid 28 istransmitted through the thermal exchanging device 24 to the firstgroundwater flow 210, which is then drained from the thermal exchangingdevice 24 as the second thermal fluid 29, the second thermal fluid 29having a temperature lower than that of the first thermal fluid 28.Then, the second thermal fluid 29 flows back to the air-conditioningtool 27 for subsequent use in the cooling task.

In addition, the first groundwater flow 210 from the confined aquiferzone 212 will, under acceleration of the power device 23, form a slowwater flowing into the flow channel 22 with the guidance of the firstdiversion device 21. When flowing through the thermal exchanging device24, the first groundwater flow 210 becomes a coolant therefor. Since thefirst groundwater flow 210 has a temperature lower than that of thefirst thermal fluid 28, the first groundwater flow 210 receives the heatof the first thermal fluid 28 through the thermal exchanging device 24.As such, the purpose of removing the heat of the first thermal fluid 28is achieved. After passing the thermal exchanging device 24, the firstgroundwater flow 211 is converted into the second groundwater flow 212.Since the heat of the second groundwater flow 212 is received by thefirst thermal fluid 28, the temperature of the second groundwater flow212 is higher than that of the first groundwater flow 211. Next, thesecond groundwater flow 212 continues to flow into the power device 23and then the third diversion device 26. Finally, the second ground water212 is guided by the third diversion device 26 to the confined aquiferzone 212.

In this manner, since the first groundwater flow 210 from the naturalwater source flows back to the confined aquifer zone 212 in the form ofthe second groundwater flow 211 and the coolant is also the naturalwater flow, the natural water cooling device is used with benefit of thecontinuous natural water source.

Referring to FIG. 3, a schematic diagram for illustrating how therecurring natural water cooling device operates according to a secondembodiment of the present invention is depicted therein. In thisembodiment, the recurring natural water cooling device comprises a firstdiversion device 31, a flow channel 32, a power device 33, a thermalexchanging device 34, a second diversion device 35, a third diversiondevice 36 and an air-conditioning tool 37. The air-conditioning tool 37drains out a first thermal fluid 38. After being processed by thethermal exchanging device 34, the first thermal fluid 38 is convertedinto a second thermal fluid 39. A first groundwater flow 310 serves as acoolant for the thermal exchanging device 34. A second groundwater flow311 is used to receive the heat of the first thermal fluid 38. In thisembodiment, a confined aquifer zone 312 is used as the natural watersource. The first, second and third diversion devices 31, 35, 36 form aplurality of diversion devices for the recurring natural water coolingdevice. The characteristic of FIG. 3 lies in that the flow channel 32and the thermal exchanging device 34 are formed on the ground.

In forming the recurring natural water cooling device, the firstdiversion device 31 is first formed. In this embodiment, the firstdiversion device 31 is a well or any device which can achieve thepurpose of water guiding. The first diversion device 31 has to beconnected to the confined aquifer zone 312 so that the flow channel 32is connected with the confined aquifer zone 312 and the firstgroundwater flow 310 can be provided to the flow channel 32. Inaddition, the first diversion device 31 is used for accommodating thepower device 33 and for the first groundwater flow 310 to flow therein.However, the first diversion device 31 may be implemented in many formsother than the above-mentioned one.

Then, the flow channel 32 is formed, in which a room sufficient fordisposition of the thermal exchanging device 34 and for the firstgroundwater flow 210 to flow therein has to be provided. The flowchannel 32 may be one formed artificially on the ground. However, theflow channel 32 may be implemented in many forms other than theabove-mentioned one.

Subsequently, the second diversion device 35 is formed. The seconddiversion device 35 is a tube for water guiding and used to connect thepower device 33 with the flow channel 32 and the flow channel 32 withthe third diversion device 36, respectively. The second diversion device35 may be a metal tube, a concrete tube or any other devices which canbe used for water guiding, as long as the same purpose can be achieved.In addition, the second diversion device 35 may be one formedartificially or naturally. The second diversion device 35 is used toguide the first groundwater flow 310 drained out from the power device33 to the flow channel 32 and the second groundwater flow 311 drainedout from the flow channel 32 to the third diversion device 36.

The third diversion device 36 is a recharge well of the groundwater,which can be one formed artificially or naturally according to actualneeds. The third diversion device 36 is connected to the seconddiversion device 35 and the confined aquifer zone 312 so as to directthe second groundwater flow 311 to flow back to the confined aquiferzone 312. In this manner, the purpose of environment protection may beachieved since the groundwater obtained from the underground can flowback to the underground after being utilized for the cooling task. Infact, the second and third diversion devices 35, 36 may be implementedin many forms other than the above-mentioned one.

In the recurring natural water cooling device, the thermal exchangingdevice 34 is placed in the flow channel 32 and the power device 33 isplaced in the first diversion device 31. In this embodiment, the powerdevice 33 is a pump. The power device 33 accelerates the firstgroundwater flow 310 in the diversion device 31 to flow through the flowchannel 32 and surround the thermal exchanging device 34. Then, thefirst groundwater flow 310 is guided to the second diversion device 35.Since the flow channel 32 is a water container above the ground, thepower device 33 may be placed above or below the ground and differentlyarranged according to the form of the flow channel 32. However, thepower device 33 may have other embodiments other than theabove-mentioned one.

In operation, the first thermal fluid 38 drained from theair-conditioning tool 37 is a waste heat containing fluid in any form,which is then directed to the thermal exchanging device 34. The coolantfor the thermal exchanging device 34 is the first groundwater flow 310.Since the first groundwater flow 310 has a temperature lower than thatof the first thermal fluid 38, the heat of the first thermal fluid 38 istransmitted through the thermal exchanging device 34 to the firstgroundwater flow 310, which is then drained from the thermal exchangingdevice 34 as the second thermal fluid 39, the second thermal fluid 39having a temperature lower than that of the first thermal fluid 38.Next, the second thermal fluid 39 flows back to the air-conditioningtool 37 for subsequent use in the cooling task.

In addition, the first groundwater flow 310 from the confined aquiferzone 312 will, under acceleration of the power device 33, form a slowwater flowing to the flow channel 32 with the guidance of the first andsecond diversion devices 31, 35. When flowing through the thermalexchanging device 34, the first groundwater flow 310 becomes a coolanttherefor. Since the first groundwater flow 310 has a temperature lowerthan that of the first thermal fluid 38, the first groundwater flow 310receives the heat of the first thermal fluid 38 through the thermalexchanging device 34. As such, the purpose of removing the heat of thefirst thermal fluid 28 is achieved. After passing the thermal exchangingdevice 34, the first groundwater flow 311 is converted into the secondgroundwater flow 312. Since the heat of the second groundwater flow 312is received by the first thermal fluid 38, the temperature of the secondgroundwater flow 312 is higher than that of the first groundwater flow311. Next, the second groundwater flow 312 continues to flow into thesecond diversion device 35 and then the third diversion device 36.Finally, the second ground water 312 is guided by the third diversiondevice 36 to the confined aquifer zone 312.

In this manner, since the first groundwater flow 310 from the naturalwater source flows back to the confined aquifer zone 312 in the form ofthe second groundwater flow 311 and the coolant is also the naturalwater, the natural water cooling device is used with benefit of thecontinuous natural water source.

The above embodiments may be achieved by directly replacing the casingof the conventional thermal exchanger with the flow channel and usingthe natural water as the coolant. As such, a simple form of therecurring natural water cooling device is obtained. Such thermalexchanger has the advantages of environment protection, energy saving,sustainable use, high efficiency, easy purge, convenient maintenance,and enhancing the efficiency which is originally lowered by theimpurities choked in the thermal exchanger.

Referring to FIG. 4, the thermal exchanging device of the presentinvention is schematically depicted therein. The thermal exchangingdevice comprises a thermal conductive tube 41 and a tube plate 42. Thethermal conduction tube 41 serves as a heat transferring device. Thefirst natural water 45 serves as a coolant. A first natural water 45 isreferred to the first groundwater flow 210 in the first embodiment andthe first groundwater flow 310 in the second embodiment. A secondnatural water 46 is referred to the second groundwater 211 in the firstembodiment and the second groundwater 311 in the second embodiment.

The thermal conduction tube 41 is a wound metal tube for the firstthermal fluid 43 to flow therein. The thermal conduction tube 41 issupported by the tube plate 42 and totally surrounded by the coolant,i.e. the first natural water 45. Since the metal of the thermalconduction tube 41 has an excellent thermal conduction characteristic,the heat of the first thermal fluid 43 flown through the thermalconduction tube 41 is received by the first natural water 45. Thus, thetemperature of the first thermal fluid 43 is reduced gradually andconverted into the second thermal fluid 44 having a temperature higherthan that of the first thermal fluid 43. Then, the second thermal fluid44 flows back to the air-conditioning tool as mentioned above. In fact,the thermal exchanging device may have many other forms other than theabove-mentioned one.

It is demonstrated in experiments that the thermal exchanging efficiencyand the noise issue of the recurring natural water cooling device of thepresent invention are significantly improved as compared to those in theprior art, on the condition that the thermal exchanging devices in thetwo cases are selected the same in area. In conclusion, the recurringnatural water cooling device of the present invention can achieve thewater cooling function with reduced energy consumption, pollution,noises and waste heat.

While the invention has been described in terms of what is presentlyconsidered to be the most practical and preferred embodiments, it is tobe understood that the invention needs not be limited to the disclosedembodiments. Therefore, it is intended to cover various modificationsand similar arrangements included within the spirit and scope of theappended claims, which are to be accorded with the broadestinterpretation so as to encompass all such modifications and similarstructures.

1. A recurring natural water cooling device, comprising: a flow channelthrough which a natural water flow from a natural water source iscirculated; a thermal exchanging device through which a thermal fluidflows and being placed in the flow channel so as to transfer a heat ofthe thermal fluid to the natural water flow; a power device speeding upthe circulated natural water; and a plurality of diversion devicescommunicatively connecting the natural water source and the flowchannel.
 2. The recurring natural water cooling device as claimed inclaim 1, wherein the circulated natural water flows back to the naturalwater source.
 3. The recurring natural water cooling device as claimedin claim 1, wherein the natural water source is one of a surface watersource and a groundwater source.
 4. The recurring natural water coolingdevice as claimed in claim 1, wherein each of the plurality of diversiondevices is one of a diversion device formed artificially and a diversiondevice formed naturally.
 5. The recurring natural water cooling deviceas claimed in claim 1, wherein the power device is placed in the flowchannel.
 6. The recurring natural water cooling device as claimed inclaim 1, wherein the power device is placed in the plurality ofdiversion devices.
 7. The recurring natural water cooling device asclaimed in claim 1, wherein the flow channel is one of a flow channelformed artificially and a flow channel formed naturally.
 8. Therecurring natural water cooling device as claimed in claim 1, whereinthe power device is a pump.
 9. The recurring natural water coolingdevice as claimed in claim 1, wherein the thermal exchanging devicecomprises: a coolant being the natural water; and a heat transferringdevice through which the thermal fluid flows and surrounded by thecoolant so as to transfer the heat of the thermal fluid to the coolant.10. The recurring natural water cooling device as claimed in claim 9,wherein the heat transferring device is a wound metal tube.
 11. Arecurring natural water cooling device, comprising: a flow channelthrough which a natural water from a natural water source is circulated;a heat transferring device through which a thermal fluid flows and beingplaced in the flow channel so as to transfer a heat of the thermal fluidto the natural water; and a plurality of diversion devicescommunicatively connected between the natural water source and the flowchannel.
 12. The recurring natural water cooling device as claimed inclaim 11, wherein the circulated natural water flow flows back to thenatural water source.
 13. The recurring natural water cooling device asclaimed in claim 11, wherein the natural water source is one of asurface water source and a groundwater source.
 14. The recurring naturalwater cooling device as claimed in claim 11, wherein each of theplurality of diversion devices is one of a diversion device formedartificially and a diversion device formed naturally.
 15. The recurringnatural water cooling device as claimed in claim 11, wherein the thermalexchanging device comprises: a coolant being the natural water; and aheat transferring device through which the thermal fluid flows, andsurrounded by the coolant so as to transfer the heat of the thermalfluid to the coolant.
 16. The recurring natural water cooling device asclaimed in claim 15, wherein the heat transferring device is a woundmetal tube.
 17. A cooling system, comprising: a natural water sourceproviding a natural water; a thermal exchanging device transferring aheat from a thermal fluid to the natural water; and a connecting deviceconnected between the natural water source and the thermal exchangingdevice.
 18. The cooling system as claimed in claim 17, wherein thenatural water flows back to the natural water source after having theheat from the thermal fluid.
 19. The cooling system as claimed in claim17, wherein the natural water source is one of a surface water sourceand a groundwater source.